uttered vs expressed

uttered and expressed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
uttered	No	Yes	No	No
expressed	No	Yes	No	No

As adjectives, uttered and expressed are synonyms defined as:

Other synonyms of uttered include verbalised, verbalized, voiced.

uttered (adjective)	expressed (adjective)
communicated in words	precisely and clearly expressed or readily observable; leaving nothing to implication
	communicated in words