inlet vs siamese

inlet and siamese both are nouns.

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

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

inlet: an opening through which fluid is admitted to a tube or container
siamese: an inlet with two or more couplings to which a hose can be attached so that fire engines can pump water into the sprinkler system of a building

Other hyponyms of inlet include air horn, siamese connection.

inlet (noun)	siamese (noun)
an opening through which fluid is admitted to a tube or container	an inlet with two or more couplings to which a hose can be attached so that fire engines can pump water into the sprinkler system of a building
an arm off of a larger body of water (often between rocky headlands)