The word macrospores is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 20
Highest Scoring Words With Friends™ Play In The Letters macrospores
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Seven Letter Word Alert: (39 words)
campers, carpers, coarser, compare, compass, compose, corpora, corpses, crasser, crosser, escarps, oosperm, parsecs, parsers, poromas, poroses, prearms, process, prosoma, raspers, recross, resorps, roamers, rompers, roomers, scamper, scapose, scarers, scooper, scorers, scraper, scrapes, screams, searoom, soapers, soarers, spacers, sparers, sparser