port watcher vs watcher

port watcher and watcher both are nouns.

Word	Noun	Adjective	Verb	Adverb
port watcher	Yes	No	No	No
watcher	Yes	No	No	No

As nouns, watcher is a hypernym of port watcher; that is, watcher is a word with a broader meaning than port watcher:

Other hypernyms of port watcher include security guard, watchman.

port watcher (noun)	watcher (noun)
a watchman on a wharf	a guard who keeps watch
	a close observer; someone who looks at something (such as an exhibition of some kind)
	a person who keeps a devotional vigil by a sick bed or by a dead body