omelet vs firm omelet

omelet and firm omelet both are nouns.

Word	Noun	Adjective	Verb	Adverb
omelet	Yes	No	No	No
firm omelet	Yes	No	No	No

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

omelet: beaten eggs or an egg mixture cooked until just set; may be folded around e.g. ham or cheese or jelly
firm omelet: eggs beaten with milk or cream and cooked until set

Other hyponyms of omelet include fluffy omelet, egg foo yong, egg fu yung.

omelet (noun)	firm omelet (noun)
beaten eggs or an egg mixture cooked until just set; may be folded around e.g. ham or cheese or jelly	eggs beaten with milk or cream and cooked until set