sigeh vs spousal relationship

sigeh and spousal relationship both are nouns.

Word	Noun	Adjective	Verb	Adverb
sigeh	Yes	No	No	No
spousal relationship	Yes	No	No	No

As nouns, spousal relationship is a hypernym of sigeh; that is, spousal relationship is a word with a broader meaning than sigeh:

sigeh: a Shiite tradition of temporary marriage permitted in Iran that allows a couple to specify the terms of their relationship; can last from a few minutes to 99 years
spousal relationship: the state of being a married couple voluntarily joined for life (or until divorce)

Other hypernyms of sigeh include marriage, matrimony, union, wedlock.

sigeh (noun)	spousal relationship (noun)
a Shiite tradition of temporary marriage permitted in Iran that allows a couple to specify the terms of their relationship; can last from a few minutes to 99 years	the state of being a married couple voluntarily joined for life (or until divorce)