Probationary rhymes with:
deflationary, disinflationary, inflationary, noninflationary, stationary, stationery, cautionary, concessionary, confectionary, confectionery, counterrevolutionary, deflationary, dictionary, discretionary, disinflationary, evolutionary, expansionary, expeditionary, functionary, inflationary, missionary, noninflationary, reactionary, recessionary, revolutionary, stationary, stationery