The word archegonium 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: 23
Highest Scoring Words With Friends™ Play In The Letters archegonium
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Seven Letter Word Alert: (50 words)
arching, arenium, carmine, chagrin, chainer, changer, chimera, choragi, choregi, choring, chroman, coinage, coreign, cougher, courage, cranium, echoing, enamour, genomic, gouache, grimace, harming, hearing, homerun, humaner, incomer, inreach, ironage, machine, mangier, marconi, menorah, monarch, moraine, neuroma, numeric, oghamic, organic, reaming, rechain, rhenium, rheumic, roaming, romaine, romance, roughen, unchair, uncharm, uncrime, uraemic