croup vs quadruped

croup and quadruped both are nouns.

Word	Noun	Adjective	Verb	Adverb
croup	Yes	No	No	No
quadruped	Yes	Yes	No	No

croup (noun)	quadruped (noun)
the part of an animal that corresponds to the human buttocks	an animal especially a mammal having four limbs specialized for walking
a disease of infants and young children; harsh coughing and hoarseness and fever and difficult breathing

croup (adjective)	quadruped (adjective)
	having four feet