Mull vs island

Mull and island both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mull	Yes	No	No	No
island	Yes	No	No	No

Mull (noun)	island (noun)
an island in western Scotland in the Inner Hebrides	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water