is for

Reel,
Radish,
Ruff,
Reeve, and
Rack;

is for

Skate,
Salmon,
Sprat,
Saw, and
School;

is for

Tin,
Teapot,
Tar,
Torch, and
Tool;

is for

Urn,
Usher,
Umpire, and
Use;

is for