porter vs skycap

porter and skycap both are nouns.

Word	Noun	Adjective	Verb	Adverb
porter	Yes	No	Yes	No
skycap	Yes	No	No	No

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

Other hyponyms of porter include redcap.

porter (noun)	skycap (noun)
a very dark sweet ale brewed from roasted unmalted barley	a porter who helps passengers with their baggage at an airport
a person employed to carry luggage and supplies
a railroad employee who assists passengers (especially on sleeping cars)
someone who guards an entrance

porter (verb)	skycap (verb)
carry luggage or supplies