fierce vs boisterous

fierce and boisterous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fierce	No	Yes	No	No
boisterous	No	Yes	No	No

As adjectives, fierce and boisterous are synonyms defined as:

Other synonyms of fierce include rough.

fierce (adjective)	boisterous (adjective)
marked by extreme intensity of emotions or convictions; inclined to react violently; fervid	noisy and lacking in restraint or discipline
ruthless in competition	full of rough and exuberant animal spirits
violently agitated and turbulent	violently agitated and turbulent
marked by extreme and violent energy