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From letters F, E, R, R, O, M, A, N, G, A, N, E, S, E, S  I made following words

15 letter words

ferromanganeses[21]

14 letter words

ferromanganese[20]

10 letter words

nonfarmers[15], freemasons[15], manganeses[13], manageress[13], meagerness[13], mergansers[13], anageneses[11]

9 letter words

nonfarmer[14], forenames[14], freemason[14], farragoes[13], manganese[12], nanograms[12], merganser[12], aerograms[12], renograms[12], messenger[12], sagamores[12], seafarers[12], foreseers[12], anamneses[11], ransomers[11], sangarees[10], eagerness[10], greenness[10], engrosser[10], ensnarers[9], reasoners[9]

8 letter words

germfree[14], fromages[14], forename[13], enframes[13], fearsome[13], foramens[13], reframes[13], forearms[13], foragers[12], reforges[12], serfages[12], nanogram[11], aerogram[11], renogram[11], mongeese[11], agnomens[11], managers[11], sagamore[11], foreseen[11], seafarer[11], remerges[11], foreseer[11], gameness[11], massager[11], freeness[11], foresees[11], gossamer[11], anemones[10], amarones[10], sonarman[10], monerans[10], sonarmen[10], marranos[10], ransomer[10], meanness[10], anemoses[10], mannoses[10], moreness[10], smearers[10], remorses[10], sangaree[9], arranges[9], regreens[9], renegers[9], groaners[9], ageneses[9], goneness[9], agaroses[9], greasers[9], ensnarer[8], reasoner[8], ensnares[8], nearness[8], rennases[8], reseason[8], seasoner[8], rareness[8], sneerers[8], serranos[8]

7 letter words

fromage[13], frogman[13], frogmen[13], enframe[12], freeman[12], freemen[12], foramen[12], foreman[12], foremen[12], nonfarm[12], reframe[12], forearm[12], foamers[12], farmers[12], framers[12], formers[12], reforms[12], farrago[11], forager[11], reforge[11], fanegas[11], agrafes[11], serfage[11], forages[11], forgers[11], agnomen[10], nongame[10], manager[10], germane[10], marengo[10], megaron[10], remerge[10], foreran[10], manages[10], sagamen[10], maneges[10], menages[10], mangoes[10], genomes[10], emerges[10], mergees[10], engrams[10], germans[10], mangers[10], germens[10], fanners[10], foresee[10], morgans[10], mongers[10], morgens[10], fearers[10], reefers[10], mergers[10], massage[10], megasse[10], message[10], anemone[9], amarone[9], moneran[9], marrano[9], mannose[9], meaners[9], renames[9], manners[9], oarsman[9], ramonas[9], enamors[9], moaners[9], oarsmen[9], moreens[9], reamers[9], smearer[9], remoras[9], roamers[9], remorse[9], marrons[9], nemeses[9], amasser[9], seamers[9], neogene[8], eagerer[8], arrange[8], greener[8], regreen[8], reneger[8], groaner[8], goannas[8], nonages[8], enrages[8], reneges[8], agarose[8], angoras[8], onagers[8], oranges[8], greaser[8], regears[8], garners[8], rangers[8], garrons[8], senegas[8], geneses[8], greases[8], ensnare[7], rennase[7], arenose[7], earners[7], reearns[7], serener[7], sneerer[7], serrano[7], oneness[7]