uninominal system vs scrutin uninominal voting system

uninominal system and scrutin uninominal voting system both are nouns.

Word	Noun	Adjective	Verb	Adverb
uninominal system	Yes	No	No	No
scrutin uninominal voting system	Yes	No	No	No

As nouns, uninominal system and scrutin uninominal voting system are synonyms defined as:

uninominal system and scrutin uninominal voting system: based on the principle of having only one member (as of a legislature) selected from each electoral district

Other synonyms of uninominal system include scrutin uninomial system, single-member system, uninominal voting system.

uninominal system (noun)	scrutin uninominal voting system (noun)
based on the principle of having only one member (as of a legislature) selected from each electoral district	based on the principle of having only one member (as of a legislature) selected from each electoral district