Mammoth Uncensored Word List:
124 words ending with m, 4 letters long

ahem alum atom azym balm barm beam berm blam boom borm brim calm caum chum clam coom corm cram crem culm deem derm doom dorm doum dram drum dwam exam farm fehm film firm foam form from gaum germ geum gism glim glom glum gram grim grum haem halm harm hawm helm imam item jism kaim leam loam loom lyam maim malm marm mumm neum norm ogam ovum oxim palm perm pium plim plum poem pram prim prom quim ream riem roam room roum saim scam scum seam seem sham shim skim slam slim slum soom soum sowm spam spim stem stim stum swam swim swum team teem term them toom tram trim vehm warm wasm weem wham whim whom worm yelm ylem zoom