earlobe vs lobe

earlobe and lobe both are nouns.

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

As nouns, lobe is a hypernym of earlobe; that is, lobe is a word with a broader meaning than earlobe:

earlobe (noun)	lobe (noun)
the fleshy pendulous part of the external human ear	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