Hydras rhymes with:
alessandra's, deidre's, saundra's, admira's, aguirra's, alessandra's, andoras, angoras, artra's, asmaras, astra's, barras, basara's, berra's, booras, borras, buras, calaveras, camera's, cara's, cara'veras, caras, carras, chitra's, clara's, cleopatra's, cobras, conagra's, contras, contras', cora's, deidre's, era's, eras, extras, fidora's, garroz, genres, gingras, guevara's, harrah's, ira's, iras, jura's, juras, karas, karras, kashiwahara's, kuras, laura's, lira's, lueras, maras, matra's, maura's, mcnamara's, menorah's, menorahs, niagara's, nomura's, nora's, o'hara's, ohara's, opera's, operas, oprah's, orchestra's, orchestras, pandora's, pantera's, parras, perras, petras, pietras, safra's, sankara's, sara's, sarah's, saundra's, serra's, sierra's, sierras, sinatra's, spectra's, stora's, tara's, taras, terra's, tiaras, ultra's, veras, zebras
Hydras sounds like:
haters, hatrick, hatteras, headdress, headdresses, headers, headrick, headwaters, heaters, heather's, heathers, heathrow's, hedrich, hedrick, heidrich, heidrick, heterosis, heterozygous, hetrick, hettrick, hitters, hooters, hydrick, hydro's, hydrous, hydrox, hydroxy