Hydrants rhymes with:
adherents, arrants, barents, celebrants, emigrants, entrants, grandparents, grandparents', immigrant's, immigrants, immigrants', marantz, migrants, parent's, parents, parents', registrants, torrents, tyrants, vagrants, warrants
adherents, arrants, barents, celebrants, emigrants, entrants, grandparents, grandparents', immigrant's, immigrants, immigrants', marantz, migrants, parent's, parents, parents', registrants, torrents, tyrants, vagrants, warrants