Consummate a marriage.
After the reception, he escorted her to the honeymoon suite to consummate their marriage.
Word: "consummate"
the same meaning

This nest egg will ensure a nice retirement for us.
Our exertions ensured us a good outcome.
Word: "ensure"
the same meaning

I like to treat myself to a day at a spa when I am depressed.
Treat the infection with antibiotics.
Word: "treat"
different meanings

Float a ship.
The boat floated on the water.
Word: "float"

different meanings