Headmost(a.) Most advanced; most forward; as, the headmost ship in a fleet.
Thesaurus Entries
acmatic, ahead, antecedent, anterior, apical, arch, banner, before, capital, cardinal, central, champion, chief, consummate, crowning, dominant, exordial, first, focal, fore, foregoing, forehand, foremost, forward, front, frontal, great, head, heading, hegemonic, highest, in advance, in front, in the forefront, in the foreground, in the front, in the lead, inaugural, initiatory, leading, magisterial, main, master, maximal, maximum, meridian, meridional, overmost, overruling, paramount, precedent, preceding, precessional, precursory, predominant, preeminent, prefatory, preliminary, preludial, prelusive, preparatory, preponderant, prevailing, prevenient, primal, primary, prime, principal, prior, proemial, propaedeutic, ranking, ruling, sovereign, star, stellar, summital, supereminent, supreme, tip-top, to the fore, to the front, top, topflight, topmost, ultimate, up ahead, upmost, uppermost, vertical, zenithal