あと、
forward、forwards が 前、前に と同じだろ？
https://en.wiktionary.org/wiki/forwards
Etymology 3[edit]
From Middle English -es, from Old English -es (“masc-neut genitive ending of most nouns”). More at -'s.
Suffix[edit]
-s
1.(not productive) used in the formation of certain English adverbs. backwards; downwards; homewards; inwards; outwards; sidewards; skywards; towards; upwards; betides; besides; betimes; sometimes;always; sideways; crossways; anyways; unawares; needs; eftsoons; anyhows; whiles; athwartships; amidships; upstairs; downstairs;eastwards; westwards; southwards; northwards; leewards; forwards; shorewards; landwards; seawards; sternwards; larboards;starboards; ofttimes; evenings; otherwhiles;