inversion vs upending

inversion and upending both are nouns.

Word	Noun	Adjective	Verb	Adverb
inversion	Yes	No	No	No
upending	Yes	No	No	No

As nouns, inversion and upending are synonyms defined as:

inversion (noun)	upending (noun)
turning upside down; setting on end	turning upside down; setting on end
the act of turning inside out
a term formerly used to mean taking on the gender role of the opposite sex
the reversal of the normal order of words
(counterpoint) a variation of a melody or part in which ascending intervals are replaced by descending intervals and vice versa
(genetics) a kind of mutation in which the order of the genes in a section of a chromosome is reversed
the layer of air near the earth is cooler than an overlying layer
a chemical process in which the direction of optical rotation of a substance is reversed from dextrorotatory to levorotary or vice versa
abnormal condition in which an organ is turned inward or inside out (as when the upper part of the uterus is pulled into the cervical canal after childbirth)