Here are the words you read, with the stressed vowels in bold type:
hospital
affair
police
conference
perish
In English words of more than three syllables, there is a syllable with primary stress and a syllable with secondary stress. Syllables with secondary stress are spoken with less of an increase in volume than syllables with primary stress. Read the following English words aloud and listen for the stressed syllables.
conversation
interrogation
confidential
celebrated
complicated