recession vs concave shape

recession and concave shape both are nouns.

Word	Noun	Adjective	Verb	Adverb
recession	Yes	No	No	No
concave shape	Yes	No	No	No

As nouns, concave shape is a hypernym of recession; that is, concave shape is a word with a broader meaning than recession:

Other hypernyms of recession include concavity, incurvation, incurvature.

recession (noun)	concave shape (noun)
the act of becoming more distant	a shape that curves or bends inward
the act of ceding back
the withdrawal of the clergy and choir from the chancel to the vestry at the end of a church service
a small concavity
the state of the economy declines; a widespread decline in the GDP and employment and trade lasting from six months to a year