pullet vs hen

pullet and hen both are nouns.

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

As nouns, hen is a hypernym of pullet; that is, hen is a word with a broader meaning than pullet:

Other hypernyms of pullet include biddy.

pullet (noun)	hen (noun)
young hen usually less than a year old	adult female chicken
flesh of a medium-sized young chicken suitable for frying	adult female bird
	female of certain aquatic animals e.g. octopus or lobster
	flesh of an older chicken suitable for stewing