[1] : The Collaborative International Dictionary of English v.0.48

pea \pea\, n.; pl. peas p=ez or pease p=ez. oe.
   pese, fr. as. pisa, or of. peis, f. pois; both fr. l. pisum;
   cf. gr. pi`sos, pi`son. the final s was misunderstood in
   english as a plural ending. cf. pease.
   1. bot. a plant, and its fruit, of the genus pisum, of
      many varieties, much cultivated for food. it has a
      papilionaceous flower, and the pericarp is a legume,
      popularly called a pod.
      1913 webster

   note: when a definite number, more than one, is spoken of,
         the plural form peas is used; as, the pod contained
         nine peas; but, in a collective sense, the form pease
         is preferred; as, a bushel of pease; they had pease at
         dinner. this distinction is not always preserved, the
         form peas being used in both senses.
         1913 webster

   2. a name given, especially in the southern states, to the
      seed of several leguminous plants species of dolichos,
      cicer, abrus, etc. esp. those having a scar hilum
      of a different color from the rest of the seed.
      1913 webster

   note: the name pea is given to many leguminous plants more or
         less closely related to the common pea. see the
         phrases, below.
         1913 webster

   beach pea bot., a seashore plant, lathyrus maritimus.
      

   black-eyed pea, a west indian name for dolichos
      sphaerospermus and its seed.

   butterfly pea, the american plant clitoria mariana,
      having showy blossoms.

   chick pea. see chick-pea.

   egyptian pea. same as chick-pea.

   everlasting pea. see under everlasting.

   glory pea. see under glory, n.

   hoary pea, any plant of the genus tephrosia; goat's rue.
      

   issue pea, orris pea. med. see under issue, and
      orris.

   milk pea. bot. see under milk.

   pea berry, a kind of a coffee bean or grain which grows
      single, and is round or pea-shaped; often used
      adjectively; as, pea-berry coffee.

   pea bug. zool. same as pea weevil.

   pea coal, a size of coal smaller than nut coal.

   pea crab zool., any small crab of the genus
      pinnotheres, living as a commensal in bivalves; esp.,
      the european species pinnotheres pisum which lives in
      the common mussel and the cockle.

   pea dove zool., the american ground dove.

   pea-flower tribe bot., a suborder papilionaceae of
      leguminous plants having blossoms essentially like that of
      the pea. --g. bentham.

   pea maggot zool., the larva of a european moth tortrix
      pisi, which is very destructive to peas.

   pea ore min., argillaceous oxide of iron, occurring in
      round grains of a size of a pea; pisolitic ore.

   pea starch, the starch or flour of the common pea, which is
      sometimes used in adulterating wheat flour, pepper, etc.
      

   pea tree bot., the name of several leguminous shrubs of
      the genus caragana, natives of siberia and china.

   pea vine. bot.
      a any plant which bears peas.
      b a kind of vetch or tare, common in the united states
          lathyrus americana, and other similar species.

   pea weevil zool., a small weevil bruchus pisi which
      destroys peas by eating out the interior.

   pigeon pea. bot. see pigeon pea.

   sweet pea bot., the annual plant lathyrus odoratus;
      also, its many-colored, sweet-scented blossoms.
      1913 webster
see also:
peas pease pisum dolichos cicer abrus 
beach pea lathyrus maritimus black-eyed pea dolichos sphaerospermus butterfly pea 
clitoria mariana chick pea chick-pea egyptian pea everlasting pea 
everlasting glory pea glory hoary pea tephrosia 
issue pea orris pea issue orris milk pea 
milk pea berry pea bug pea weevil pea coal 
pea crab pinnotheres pinnotheres pisum pea dove pea-flower tribe 
papilionaceae pea maggot tortrix pisi pea ore pea starch 
pea tree caragana pea vine lathyrus americana bruchus pisi 
pigeon pea sweet pea lathyrus odoratus 

[2] : WordNet (r) 2.0

pea crab
     n : tiny soft-bodied crab living commensally in the mantles of
         certain bivalve mollusks

Chick Pea >> C Words
Chick Pea, definition of term: Chick Pea
chick+pea_pag1.html

Black-Eyed Pea >> B Words
Black-Eyed Pea, definition of term: Black-Eyed Pea
black-eyed+pea_pag1.html

Beach Pea >> B Words
Beach Pea, definition of term: Beach Pea
beach+pea_pag1.html