successor, repair, understudy, substitutes, stopgap, heir apparent, backup, placeholder, removal, departure, partial denture, fix, fallback, reface, upgrade, alternatives, subbing, troffer, maintenance, reconditioning, appointment, interim, reshuffle, retires, filling, unavailability, resignation, reline, starter, option, warhorse, ouster, retreads, repairperson, choice, reinstatement, selection, swansong, arthroscopy, complement, reappointment, roadmaster, resurfacing, overhauls, alterative, retrofitting, additions, vacancy, savior, remainder, fit, reinforcements, rebuilding, extension, refitting, patching, headhunt, rejig, shakeup, workhorse, modifications, candidate, prop, inclusion, suspension, caretaker, alternates, switch, aging, restoration, refurbishment, rebuilder, running mate, makeweight, shuffle, sacking, remedy, retirement, malfunctioning, frontrunner, tuberosity, refinishing, meniscectomy, surgery, degenerative arthritis, insertion, warrantee, designee, absence, installation, stabilizer, changeover, return, rejuvenation, availability, renewal, backfill, swan song, filler, axing, graving dock, crosstie, replacements, elimination, replenishment, substitution, cleanup, incorporation, reassignment, reinvestment, relocation, servicing, transplanting, debridement, decontamination, dismantling, evacuation, freezing, optimal, premium, inventory, ment, recommended, standard, suboptimal, replaceable, incremental, initial, instructional, lnitial, savings, utilized, adjusted, affordable, benchmark

displacement, pitching change, supersedure, supersession, supplanting

arthroplasty, bunt, callback, ecological succession, estradiol patch, exchange transfusion, kingdom protoctista, loaner, novation, parts department, parts inventory, prosthesis, prosthetic device, prosthodontia, prosthodontics, protoctista, recall, salt depletion, second-string, stinking smut, substitutea, succession, truncation

backup man, compeer, equal, equivalent, exchange, fill-in, fluctuation, match, peer, relief, stand-in, substitute, variation

alternate, permutation, refilling, replacing, surrogate, transposition