promontory vs mull

promontory and mull both are nouns.

Word	Noun	Adjective	Verb	Adverb
promontory	Yes	No	No	No
mull	Yes	No	Yes	No

As nouns, mull is a hyponym of promontory; that is, mull is a word with a more specific, narrower meaning than promontory:

promontory: a natural elevation (especially a rocky one that juts out into the sea)
mull: a term used in Scottish names of promontories

Other hyponyms of promontory include point.

promontory (noun)	mull (noun)
a natural elevation (especially a rocky one that juts out into the sea)	a term used in Scottish names of promontories

promontory (verb)	mull (verb)
	reflect deeply on a subject
	heat with sugar and spices to make a hot drink