ear lobe vs lobe

ear lobe and lobe both are nouns.

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

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

ear lobe (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