sense, cense.
censual, sensual.
surge, serge.
surf, serf.
scent, cent, sent (fr. _send_).
session, cession.
sea, see.
seed, cede.
seal (_animal_), ciel or ceil, seal (_sign_).
seam, seem.
sear, sere, cere, seer.
serial, cereal.
signet, cygnet.
cist (_box_), cyst (_tumour, Gr._).
scar (_of wound_), scar (_a rock_).
skull, scull.
scale (_shell_), scale (_of balance_), scale (_of stairs_).
scald (_burn_), skald (_poet, Norse_).
scrub (_of shrubs_), scrub (_v._).
sledge (_vehicle_), sledge (_-hammer_).
slight, sleight.
slay, sleigh (_sledge_).
slate (_s._), slate (_v., abuse_).
sloe, slow.
slop (_puddle_), slop (_loose garment_).
slot (_track_), slot (_bar_).
sole (_adj._), soul, sole (_a fish_).
sow, sew.
saw (_tool_), soar, sore, saw (_maxim_), saw (fr. _see_).
soil (_ground_), soil (_defile_), soil (_v., of horses_).