breaking point vs tenseness

breaking point and tenseness both are nouns.

Word	Noun	Adjective	Verb	Adverb
breaking point	Yes	No	No	No
tenseness	Yes	No	No	No

As nouns, tenseness is a hypernym of breaking point; that is, tenseness is a word with a broader meaning than breaking point:

breaking point: (psychology) stress at which a person breaks down or a situation becomes crucial
tenseness: (psychology) a state of mental or emotional strain or suspense

Other hypernyms of breaking point include stress, tension.

breaking point (noun)	tenseness (noun)
the degree of tension or stress at which something breaks	the physical condition of being stretched or strained
(psychology) stress at which a person breaks down or a situation becomes crucial	(psychology) a state of mental or emotional strain or suspense