bird vs piciform bird

bird and piciform bird both are nouns.

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

bird: warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings
piciform bird: any of numerous nonpasserine insectivorous climbing birds usually having strong bills for boring wood

Other hyponyms of bird include dickey-bird, dickeybird, dicky-bird, dickybird, cock, hen, nester, night bird, bird of passage, protoavis, Archaeopteryx lithographica, archaeopteryx, archeopteryx, Sinornis, Ibero-mesornis, archaeornis, ratite, ratite bird, flightless bird, carinate, carinate bird, flying bird, passeriform bird, passerine, nonpasserine bird, raptor, raptorial bird, bird of prey, gallinacean, gallinaceous bird, parrot, cuculiform bird, coraciiform bird, apodiform bird, caprimulgiform bird, trogon, aquatic bird, twitterer.

bird (noun)	piciform bird (noun)
warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings	any of numerous nonpasserine insectivorous climbing birds usually having strong bills for boring wood
the flesh of a bird or fowl (wild or domestic) used as food
informal terms for a (young) woman
a cry or noise made to express displeasure or contempt
badminton equipment consisting of a ball of cork or rubber with a crown of feathers

bird (verb)	piciform bird (verb)
watch and study birds in their natural habitat