supplant

to usurp the place of, especially through intrigue or underhanded tactics

The ants prepared to supplant the roaches as the dominant insect in the kitchen; their plan was to take the roaches by surprise and drive them out.

Supplanter

One who takes the place of another through strength or trickery.

Watch your back or your deceitful brother may become your supplanter!

Often confused for someone who is fond of planting Sups. Its nothing like that at all.