Words That Rhyme With "Hydras" :

2 syllables:

Cnidus, Cyrus, fibrous, gyrus, Idas, Iras, Midas, nidus, nightdress, tigress, tyrus, virus

3 syllables:

desirous, Epirus, papyrus

4 syllables:

retrovirus, ultravirus

7 syllables:

cytomegalovirus