inlet vs loch

inlet and loch both are nouns.

Word	Noun	Adjective	Verb	Adverb
inlet	Yes	No	No	No
loch	Yes	No	No	No

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

inlet: an arm off of a larger body of water (often between rocky headlands)
loch: a long narrow inlet of the sea in Scotland (especially when it is nearly landlocked)

Other hyponyms of inlet include cove, fiord, fjord.

inlet (noun)	loch (noun)
an opening through which fluid is admitted to a tube or container	Scottish word for a lake
an arm off of a larger body of water (often between rocky headlands)	a long narrow inlet of the sea in Scotland (especially when it is nearly landlocked)