Reptile

Repudiate

Rescind

Rescue

Resort to

Restriction

Result from

Result in

Retain

Retain your old habit

Retaliation

Trade retaliation

Retention

Revenue

Reverse

The reverse of coin

Revert to

Let revert to the original subject.

Revival

Revoke

Ridge

Rudimentary

Run counter to

Sacralization

Sacrifice

Sales campaign

Sales tax

Salience

Sanction

Sanitary

Sanitation

Scales

Scales v.

Scatter

Scramble