Reducio

Pronunciation: /rɛˈdjuːsi.oʊ/ re-dew-see-oh

Description: Makes an enlarged object smaller. Counter-charm to Engorgio.

Reducto (Reductor Curse)

Pronunciation: /rɛˈdʌktoʊ/ re-duk-toh

Description: Enables the caster to explode solid objects.

(Refilling Charm)

Description: Refills whatever at which the caster points with the drink originally in the container.

Relashio

Pronunciation: /rɛˈlæʃi.oʊ/ re-lash-ee-oh

Description: A charm used to force someone or something to release that which it holds or grapples by means of shooting fiery sparks out or, underwater, shooting hot bursts of water.

Rennervate

Pronunciation: /ˈrɛnərveɪt/ ren-ər-vayt

Description: Brings someone out of unconsciousness.

Reparo

Pronunciation: /rɛˈpɑroʊ/ re-par-oh

Description: Used to repair broken or damaged objects.^[10]

(Repelling Charm)

Description: Pushes a moving object away from an invisible barrier.

Repello Muggletum (Muggle-Repelling Charm)

Pronunciation: /rɛˈpɛloʊ ˈmʊɡlətəm/ re-pel-oh mug-lə-təm

Description: Keeps Muggles away from wizarding places by causing them to remember important meetings they missed and to cause the Muggles in question to forget what they were doing in the first place.

Rictusempra (Tickling Charm)

Pronunciation: /ˌrɪktəˈsɛmprə/ rik-tə-sem-prə

Description: The subject experiences the sensation of being tickled

Riddikulus

Pronunciation: /rɨˈdɪkələs/ ri-dik-ə-ləs

Description: A spell used when fighting a Boggart, "Riddikulus" forces the Boggart to take the appearance of an object upon which the caster is concentrating. When used correctly, this will be a humorous form.