antennal vs antenna

antennal is not a noun while antenna is a noun.

Word	Noun	Adjective	Verb	Adverb
antennal	No	Yes	No	No
antenna	Yes	No	No	No

antennal (noun)	antenna (noun)
	one of a pair of mobile appendages on the head of e.g. insects and crustaceans; typically sensitive to touch and taste
	an electrical device that sends or receives radio or television signals
	sensitivity similar to that of a receptor organ

antennal (adjective)	antenna (adjective)
of or relating to antennae