swelling vs mogul

swelling and mogul both are nouns.

Word	Noun	Adjective	Verb	Adverb
swelling	Yes	No	No	No
mogul	Yes	No	No	No

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

swelling: something that bulges out or is protuberant or projects from its surroundings
mogul: a bump on a ski slope

Other hyponyms of swelling include frontal eminence, occipital protuberance, belly, caput, nub, nubble, snag, wart.

swelling (noun)	mogul (noun)
the increase in volume of certain substances when they are heated (often accompanied by release of water)	a very wealthy or powerful businessman
something that bulges out or is protuberant or projects from its surroundings	a bump on a ski slope
an abnormal protuberance or localized enlargement