Synonyms for Trace:

n.

smell, suspicion, read up on, determine, sprinkling, nib, uncover, trifle, gather, taste, tittle, snippet, fragment, minimum, ascertain, find out, nuance, establish. evidence, quarry, proof, hidden, footprint, flag, signpost, trail, track, give up, accessible, location, Among, placement. caricature, rebel, etch, rough out, throw off restraint, revolt, break away, Redraw. articulation, print, argyle, check, column, arabesque, chronology, coloration, arrangement, configuration, marks, array. leftover, piece, relic, a little, a bit, taster, sample, remains, fraction. hair, whisker, pat, streak, pluck, semblance, big, graze, feel, whiff, pick up, handle, brush, gather up, whisper, show. pin down, exemplify, set out, set forth. come-on, find, dig out, map, stumble across, locate, come across, run across. glitter, outpouring, fireworks, smoke signal, gleam, glint. inkling, wisp, glimpse, undertone, a/the ghost of something. evidence (noun)
proof.
evidence; small bit (noun)
particle, smell, relic, streak, nuance, nib, iota, footprint, minimum, dab, crumb, shadow, touch, suggestion, whiff, trail, dash, vestige, tittle, sprinkling, track, drop, speck, trifle, smidgen, hint, suspicion, proof, fragment, remains, taste, whisper, shred, snippet.
odor (noun)
smell.
particle (noun)
granule, dash, modicum, speck, mite, drop, atom, dab, smidgen, particle, Flyspeck, iota, whit, bit, crumb, scrap, grain, shred, morsel, pittance, smithereen, touch.
quantity (noun)
hint, suggestion.
relic (noun)
relic.
tinge (noun)
nib.
trace (noun)
ghost, retrace, draw, describe, delineate, tracing, line, hound, shadow, vestige, outline, suggestion, touch, hint, hunt, follow, decipher.

v.

cognition (verb)
follow.
contact (verb)
describe, delineate, line, draw.
draw (verb)
doodle, paint, depict, illustrate, render.
draw around (verb)
duplicate, map, outline, delineate, copy, sketch, show, reproduce, depict.
edge (verb)
edge, fringe, limit, bound, border, ring, rim, outline, contour.
outline (verb)
figure, sketch, delineate, form, profile, circumscribe, frame, plan, draft, represent, silhouette, draw.
reproduce (verb)
copy, imitate, duplicate, replicate, transcribe, procreate, clone, reproduce.
seek, follow (verb)
determine, ascertain, hunt, find.

Other synonyms:

quarry, Redraw, taster, inkling, hidden, relic, undertone, run across, stumble across, etch, snippet, signpost, smell, come across, location. whiff, Among, whisker, smoke signal, outpouring, fragment, flag, wisp, placement, fraction, dig out. caricature, map, accessible, locate, semblance. glimpse, hair, glint, sample, whisper, print, give up, streak. gleam, remains. glitter, piece. find. come-on. draw
etch.
duplicate
copy.
ferret out
dig out.
line
line.