WordNet sense 1 (court-ordered support paid by one spouse to another after they are separated):

alimony

WordNet sense 2 (the act of sustaining life by food or providing a means of subsistence):

sustenance, upkeep, sustainment, sustentation

WordNet sense 3 (the unauthorized interference in a legal action by a person having no interest in it (as by helping one party with money or otherwise to continue the action) so as to obstruct justice or promote unnecessary litigation or unsettle the peace of the community):

criminal maintenance

WordNet sense 4 (activity involved in maintaining something in good working order):

care