chicken vs pullet

chicken and pullet both are nouns.

Word	Noun	Adjective	Verb	Adverb
chicken	Yes	Yes	No	No
pullet	Yes	No	No	No

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

Other hyponyms of chicken include broiler, capon, frier, fryer, roaster, spatchcock, hen.

chicken (noun)	pullet (noun)
a domestic fowl bred for flesh or eggs; believed to have been developed from the red jungle fowl	young hen usually less than a year old
a foolhardy competition; a dangerous activity that is continued until one competitor becomes afraid and stops	flesh of a medium-sized young chicken suitable for frying
the flesh of a chicken used for food
a person who lacks confidence, is irresolute and wishy-washy

chicken (adjective)	pullet (adjective)
easily frightened