Here's what rhymes with ostentatious.
spacious audacious herbaceous gracious tenacious capacious sebaceous ungracious flirtatious mendacious fallacious vivacious voracious salacious efficacious vexatious loquacious Words that almost rhyme with ostentatious
basis bases chases cases places faces phases races spaces traces raises praises vases braces gazes laces mesas phrases glazes fireplaces metastases homeostasis paraphrases patience patients famous impatience contagious heinous painless bailiffs baseless mandamus plainness payments advantageous courageous stainless cadence nameless outrageous valence abeyance blameless faithless hiatus sameness shameless shapeless tasteless waitress faceless lateness fracas inpatients weightless greatness conveyance platelets pavements basements faintness graceless ignoramus straightness statements acquaintance surveillance attainments claimants fragrance reagents assailants disadvantageous placements strangeness complainants complaisance repayments vagrants quaintness arrangements engagements emplacements misstatements displacements entertainments replacements rearrangements