mogul vs swelling

mogul and swelling both are nouns.

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

As nouns, swelling is a hypernym of mogul; that is, swelling is a word with a broader meaning than mogul:

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

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