labial palpus vs outgrowth

labial palpus and outgrowth both are nouns.

Word	Noun	Adjective	Verb	Adverb
labial palpus	Yes	No	No	No
outgrowth	Yes	No	No	No

As nouns, outgrowth is a hypernym of labial palpus; that is, outgrowth is a word with a broader meaning than labial palpus:

labial palpus: A labial palpus is either of the jointed appendages on the front of the mentum of an insect.
outgrowth: a natural prolongation or projection from a part of an organism either animal or plant

Other hypernyms of labial palpus include mouthpart, appendage, process.

labial palpus (noun)	outgrowth (noun)
A labial palpus is either of the jointed appendages on the front of the mentum of an insect.	a natural prolongation or projection from a part of an organism either animal or plant
	the gradual beginning or coming forth
	a natural consequence of development