tightlipped vs closemouthed

tightlipped and closemouthed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
tightlipped	No	Yes	No	No
closemouthed	No	Yes	No	No

As adjectives, tightlipped and closemouthed are synonyms defined as:

tightlipped and closemouthed: inclined to secrecy or reticence about divulging information

Other synonyms of tightlipped include close, closelipped, secretive.

tightlipped (adjective)	closemouthed (adjective)
inclined to secrecy or reticence about divulging information	inclined to secrecy or reticence about divulging information