Any parent considers the safety of their children to be paramount .
✗ Any parent considers the safety of their children to be tantamount .
Your actions were tantamount to treason!
✗ Your actions were paramount to treason!
The word "paramount" means more important than anything else.
Right now our paramount concern is finding the killer before he kills again.
There's a killer on the loose, so that's the most important concern.
The word "tantamount" means "equivalent" or "the same".
Your silence in face of grave accusations is tantamount to an admission of guilt.
The speaker thinks that not replying to accusations with rapid denials is equivalent to admitting guilt.
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