What is synonym for the word slew?

The best synonym for "slew" depends on the context, but here are some options:

General meaning of "a lot":

* Many

* Numerous

* A great number

* A multitude

* A host

* A plethora

* A myriad

Meaning of "to kill in large numbers":

* Massacre

* Slaughter

* Carnage

* Annihilate

* Destroy

Meaning of "to turn or move suddenly":

* Whirl

* Spin

* Swing

* Veer

* Dart

More specific synonyms:

* Flood (for a large number of people or things)

* Array (for a large number of items)

* Bevy (for a large number of birds or women)

* Throng (for a large crowd of people)

Ultimately, the best synonym will depend on the specific meaning of "slew" in your sentence.