pecker vs piculet

pecker and piculet both are nouns.

Word	Noun	Adjective	Verb	Adverb
pecker	Yes	No	No	No
piculet	Yes	No	No	No

As nouns, piculet is a hyponym of pecker; that is, piculet is a word with a more specific, narrower meaning than pecker:

pecker: bird with strong claws and a stiff tail adapted for climbing and a hard chisel-like bill for boring into wood for insects
piculet: small woodpeckers of South America and Africa and East Indies having soft rounded tail feathers

pecker (noun)	piculet (noun)
bird with strong claws and a stiff tail adapted for climbing and a hard chisel-like bill for boring into wood for insects	small woodpeckers of South America and Africa and East Indies having soft rounded tail feathers
horny projecting mouth of a bird
obscene terms for penis