Uppermost

• POS: Adjective, Adverb
• HYPHEN: up=per=most

CIDE DICTIONARY

Uppermost, a. [From Up, Upper; formed like aftermost. Cf. Upmost.].

 Highest in place, position, rank, power, or the like; upmost; supreme.  [1913 Webster]
"Whatever faction happens to be uppermost."  [1913 Webster]

OXFORD DICTIONARY

Uppermost, adj. & adv.
--adj. (also upmost)
1 highest in place or rank.
2 predominant.
--adv. at or to the highest or most prominent position.

THESAURUS

Uppermost

above, acmatic, all-absorbing, apical, best, capital, cardinal, chief, consummate, controlling, dominant, first, first-class, first-rate, foremost, greater, greatest, head, headmost, higher, highest, leading, loftiest, main, master, maximal, maximum, meridian, meridional, most, over, overmost, overriding, overruling, paramount, predominant, preeminent, premier, primary, prime, principal, ranking, summital, superior, superlative, supreme, tip-top, top, top-notch, topmost, ultimate, upmost, upper, utmost, vertical, zenithal