Foremostly and Mostly

(adv.) In the foremost place or order; among the foremost.

adverb

• In large part; mainly or chiefly.
  • usage: "These accounts are largely inactive"
  • synonyms: largely, for the most part
• Usually; as a rule.
  • usage: "by and large it doesn't rain much here"
  • synonyms: by and large, generally, more often than not

(adv.) For the greatest part; for the most part; chiefly; in the main.