-most

From Middle English -most(e), from earlier -mest, from Old English -(e)mest, from Proto-Germanic *-umistaz, from the comparative suffix *-umô (from Proto-Indo-European *-mHo-) + the regular superlative suffix *-istaz (whence English -est). The Middle English form is due to conflation with the originally unrelated superlative most. See foremost for more.

• IPA^(key): /ˌməʊst/ (secondary stress; primary stress is on the stem)

-most

1. Furthest; -est; used to form superlatives of certain adjectives, especially directional and inherently-comparative ones.

   ‎eastern + ‎-most → ‎easternmost

   ‎nether + ‎-most → ‎nethermost

• Productivity of the suffix is limited in contemporary English.

• -more

• eldermost
• nearmost

• secondmost (variant spelling of second most)

• smot, TMOs, MTSO, mots, MOTs, SOTM, toms, Toms