Here is the list of words I found somewhere containing all the 5 vowels :-
- abstemious
- adventitious
- aeronautical
- ambidextrous
- authoritatively
- coeducation
- consequential
- educational
- efficacious
- elocutionary
- encouragingly
- equation
- equivocal
- euphorically
- evolutionary
- exclusionary
- facetiously
- gelatinous
- genitourinary
- gregariously
- heterosexuality
- homosexuality
- importunate
- instantaneous
- insubordinate
- intravenous
- mendacious
- miscellaneous
- nefarious
- neurological
- neurotically
- ostentatious
- perspicacious
- pertinacious
- praseodymium
- precarious
- precautionary
- questionable
- revolutionary
- sacrilegiously
- simultaneous
- subordinate
- tenacious
- uncomplimentary
- uncongenial
- unemotional
- unequivocally
- unexceptionably
- unintentional
- unquestionably
- unrecognizable
- veracious
- vexatious
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