Mammoth Uncensored Word List:
80 words ending with am, 8 letters long

aerogram antifoam antispam attogram barogram brockram brougham caimacam daydream decagram decigram dekagram diazepam echogram ergogram ethogram flimflam fluidram genogram gigagram granddam hardbeam hexagram hollidam hologram hornbeam icecream ideogram idiogram jeroboam kaimakam kilogram kymogram lexigram lipogram logogram mailgram marigram marjoram megagram mokaddam monogram moonbeam muqaddam nannycam nanogram nomogram nondream ondogram onstream outdream outgleam overcram overswam oxazepam panislam pappadam paragram petagram phenogam phonecam picloram picogram polygram presteam qaimaqam rehoboam renogram schiedam sealyham skiagram sonogram suncream telegram teragram tomogram upstream venogram xerogram zymogram