Mainstay is a related term of sustainer.
As nouns the difference between mainstay and sustainer
is that mainstay is a chief support while sustainer is one who sustains.
mainstay
English
Noun
(
en noun)
A chief support.
:Agriculture is the mainstay of this country’s economy.
(nautical) A stabilising rope from the top of the mainmast to the bottom of the foremast.
Anagrams
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