piciform bird vs barbet

piciform bird and barbet both are nouns.

Word	Noun	Adjective	Verb	Adverb
piciform bird	Yes	No	No	No
barbet	Yes	No	No	No

As nouns, barbet is a hyponym of piciform bird; that is, barbet is a word with a more specific, narrower meaning than piciform bird:

piciform bird: any of numerous nonpasserine insectivorous climbing birds usually having strong bills for boring wood
barbet: small brightly colored stout-billed tropical bird having short weak wings

Other hyponyms of piciform bird include pecker, peckerwood, woodpecker, puffbird, honey guide, jacamar, toucan.

piciform bird (noun)	barbet (noun)
any of numerous nonpasserine insectivorous climbing birds usually having strong bills for boring wood	small brightly colored stout-billed tropical bird having short weak wings