There are many synonyms for the word "mostly". Some of these are "mainly", "largely", "generally", "on the whole", "chiefly", "primarily" and "predominantly".
The adverb "largely" can have the synonyms chiefly, mainly, mostly, substantially, or primarily.
notably, mostly, strikingly, conspicously, outstandingly
essentially, mainly, mostly, principally, fundamentally, primarily
Some synonyms for Gothic are medieval, eerie, and grotesque.
The words that you are describing use one or the other. But mostly they are the same. They're synonyms.
They are synonyms.
Synonyms
Relative and kin are synonyms.
They are synonyms.
synonyms
Are there synonyms for washable
Synonyms for Brake:AnchorBlockConstraintDecelerateDeterrentHaltHindranceObstacleRestraintStop