The players
Prop
Hooker
Lock / Second Row
Flanker
Number Eight
Scrum-half / Half-back / Inside half (Wales only)
Fly-half / Stand-off / Outside half / First five eighth
Winger
Centre / Second five eighth (inside centre only)
Full-back

On the pitch
Referee
Touch Judge
Backs
Forwards
Halfback pairing
Openside
Blindside
Coach

Do's
Try
Conversion
Penalty try
Penalty
Drop goal
Free kick / Short (bent) arm penalty
Lineout
Scrum
Ruck
Maul
Tackle
Mark
Pass
Reverse pass
Interception
Kick
Garryowen / up-and-under

... and donts
Sin bin
Knock-on
Forward pass
Offside
Crossing in midfield / shadow
High tackle
Late tackle
Eye gouging