booby trap vs difficultness

booby trap and difficultness both are nouns.

Word	Noun	Adjective	Verb	Adverb
booby trap	Yes	No	No	No
difficultness	Yes	No	No	No

As nouns, difficultness is a hypernym of booby trap; that is, difficultness is a word with a broader meaning than booby trap:

booby trap: an unforeseen or unexpected or surprising difficulty
difficultness: the quality of being almost beyond one's ability to deal with and requiring a great effort to achieve a positive result

Other hypernyms of booby trap include difficulty.

booby trap (noun)	difficultness (noun)
an explosive mine hidden underground; explodes when stepped on or driven over	the quality of being almost beyond one's ability to deal with and requiring a great effort to achieve a positive result
an unforeseen or unexpected or surprising difficulty