Synonyms for Probe:

n.

concrete mixer, air pump, forge, grindstone, backhoe, gas turbine, jackhammer, flame thrower, cement mixer, gauge. bypass, reconnaissance, anesthetize, catheterize, bleed, catch, bandage, anaesthetize, attend, cauterize, bring back. blast off, aerospace, booster, communications satellite, apollo, Cape Canaveral, cosmonaut, feeler, astronaut, capsule. pick someone's brains, interview, put someone on the spot, inquisition, put to. eeg, drip, balloon, ekg, drain, defibrillator, electrocardiogram, ecg. pick through, go through, seek out, search out, hunt down, scavenge, look out for. opinion poll, public inquiry, elicitation, soundings, trawl, reference. experiment (noun)
experiment, analysis, investigation, test, benchmark, proof, trial, verification, determination, research.
exploration (noun)
scrutiny.
inspection (noun)
reconnaissance.
investigation (noun)
research, examination, inquiry, scrutiny, exploration, inquest, inquisition.
medical instrument (noun)
suture, cardiograph, hemostat, electrocardiograph, lance, stethoscope, respirometer, scalpel, hypodermic, syringe, electroencephalograph, Nebulizer, tongue depressor, Cystoscope, orthoscope, aspirator, ophthalmoscope, catheter, fluoroscope, forceps, Sphygmometer, radiometer, laparotomy pack.
probe (noun)
investigation, poke into, dig into, examine.
question (noun)
examination, interrogation, contemplation, interpellation, inquest, exploration.
request (noun)
solicitation, bid, invitation, want, query, appeal, requisition, desire, entreaty, urge, question, wish, petition, inquiry, plea, request, demand, summons.

v.

communication (verb)
examine.
experiment (verb)
prove, determine, analyze, try, check, assay, verify, investigate.
explore, investigate (verb)
examine, ask, check, quiz, test, interrogate, catechize, sift, query, inquire, verify, search.
feel (verb)
fumble, experience, grope, sense, feel, handle, touch, undergo, finger, respond.
question (verb)
interrogate, survey, examine, contemplate, interpolate, explore, challenge, dispute, debate, ask, canvass, delve, catechize, poll, quiz.
request (verb)
invite, summon, inquire, solicit, seek, plead.
search (verb)
peek, comb, look for, rummage, sift, pry, forage, search, rifle, peer, winnow, scour.

Other synonyms:

public inquiry, seek out, search out, opinion poll, pick through. scavenge, elicitation, inquisition, look out for, feeler, hunt down, reconnaissance. trawl, put to. interview. go through. reference. examine
dig into, winnow.
ferret out
hunt down, search out.
search
poke into, search.
Other relevant words:
gauge, communications satellite, feeler, reconnaissance, soundings, inquisition, dig into, trawl, poke into, go through, pick through, scrutiny.