lobe vs lobar

lobe is a noun but lobar is not a noun.

Word	Noun	Adjective	Verb	Adverb
lobe	Yes	No	No	No
lobar	No	Yes	No	No

lobe (noun)	lobar (noun)
a rounded projection that is part of a larger structure
(anatomy) a somewhat rounded subdivision of a bodily organ or part
the enhanced response of an antenna in a given direction as indicated by a loop in its radiation pattern
(botany) a part into which a leaf is divided

lobe (adjective)	lobar (adjective)
	of or relating to or affecting a lobe