You are either using a very bad dictionary or copying incorrectly. Both of those sentences contain errors. They should be: 1. She is/was/will be/etc convictED of the manslaughter of her husband. 2. In 1977 he was convicted of murder and sentenced to life imprisonment. In both cases, these are verbs in the passive voice.

I believe the first one is an error, unless they are trying to say She is A convict DUE TO the manslaughter of her husband. I think, as you do, that convict is a noun and a verb. But a judge convicts a criminal......

''Convict'' as a noun is someone who has been put in jail for a crime. ''Convict'' as a verb is the action of punishing someone for a crime. Both of the sentences you found are correct. The words are not really interchangeable because they have two different pronunciations. It's probably best to think of them as two different words that are spelled the same. You can listen to each pronunciation using the links below, and then clicking the sound icon. As a noun: http://www.oxfordlearnersdictionaries.com/us/definition/english/convict_2 As a verb: http://www.oxfordlearnersdictionaries.com/us/definition/english/convict_1

Thank you Kenny,so 2 one said the No.1 is wrong and one said it's correct ,all of you are native English speakers I suppose

She is convict of the manslaughter of her husband > This sentence is wrong Both should be >> was convicted . Unless , you want to say " She is a convict ( a noun)