watchful vs wakeful

watchful and wakeful both are adjectives.

Word	Noun	Adjective	Verb	Adverb
watchful	No	Yes	No	No
wakeful	No	Yes	No	No

As adjectives, watchful and wakeful are synonyms defined as:

watchful and wakeful: carefully observant or attentive; on the lookout for possible danger

Other synonyms of watchful include argus-eyed, open-eyed, vigilant.

watchful (adjective)	wakeful (adjective)
engaged in or accustomed to close observation	carefully observant or attentive; on the lookout for possible danger
experiencing or accompanied by sleeplessness	marked by full consciousness or alertness
carefully observant or attentive; on the lookout for possible danger	(of sleep) easily disturbed