Some words that end or with suffix cain:
cocain. marocain.
Words with the suffix ance:acceptanceappearancearroganceassistanceclearancecompliancecontinuancedisappearancedistanceeleganceentrancegrievancemaintenanceperformancepredominanceresistancetolerancesubstancetemperanceviligance
biography
'-oast' is not a suffix*.However, here are some words that end with -oastboastcoastoastroasttoast*See Related links below for more information.
Some words with suffix scious: conscious. subconscious. hyperconscious. semiconscious. overconscious. preconscious. unconscious.
untill andStandstillIntertillRedistillRototillDistillInstillStill