mull vs promontory

mull and promontory both are nouns.

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

As nouns, promontory is a hypernym of mull; that is, promontory is a word with a broader meaning than mull:

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

Other hypernyms of mull include foreland, head, headland.

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

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