AUTOTROPHS

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apos arts atop auto haps harp hart hasp hast hats haut hoar hoop hoot hops hora host hots hour hurt huts oars oast oath oats oohs oops oots opah opts opus orts osar otto ouph ours oust outs pars part pash past path pats phat phot phut pooh poor poos port posh post pots pour pout prao prat prau proa pros purs push puts putt raps rapt rash rasp rath rato rats rhos rhus root rota roto rots roup rout rush rust ruth ruts shat shoo shop shot shut soap soar soot soph sora sort soth soup sour spar spat spot spur star stat stoa stop stot sura tahr taos taps taro tarp tars tart tats taus taut that thou thro thru thus toot toph topo tops tora toro tors tort tosh tost tots tour tout trap trop trot tsar tups tush tuts upas urps ursa utas