fearlessness vs pluck

fearlessness and pluck both are nouns.

Word	Noun	Adjective	Verb	Adverb
fearlessness	Yes	No	No	No
pluck	Yes	No	Yes	No

As nouns, pluck is a hyponym of fearlessness; that is, pluck is a word with a more specific, narrower meaning than fearlessness:

fearlessness: the trait of feeling no fear
pluck: the trait of showing courage and determination in spite of possible loss or injury

Other hyponyms of fearlessness include coolness, nervelessness, boldness, daring, hardihood, hardiness, gutsiness, pluckiness.

fearlessness (noun)	pluck (noun)
the trait of feeling no fear	the act of pulling and releasing a taut cord
feeling no fear	the trait of showing courage and determination in spite of possible loss or injury

fearlessness (verb)	pluck (verb)
	pull or pull out sharply
	look for and gather
	pull lightly but sharply with a plucking motion
	strip of feathers
	rip off; ask an unreasonable price
	sell something to or obtain something from by energetic and especially underhanded activity