For the owner of a business, proprietor
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governor, heir, heiress, holder, keeper, landowner, partner, possessor, proprietor, purchaser, sharer, squire, titleholder.
instead of being that
effective.
customize
Apothecary
end
defeated
Programme
sequential, ordered
applied, exercised
The other word which is widely used instead of doorknob is latch.
A synonym is a word that has the same meaning as another word.
plainly, flatly, boring.