Collocations for fantastic - adj.

be, feel, look, smell, sound, taste
I felt fantastic after my swim.
This cake tastes fantastic.

really, truly, utterly
We had really fantastic weather in Rio.

absolutely, just, pretty, quite
The sense of freedom was absolutely fantastic.

be, look, seem, sound

rather
It may sound rather fantastic, but it's the truth.

Fantastic is used with these nouns:
beast, finish, job, journey, news, scenery, story, tale, trip, turnout