/ʊ/

Approximate Castilian production: The Spanish sound is produced at the back and it is tenser. A similar sound can be heard when it is next to "r" and "l": hurto, pulso...

Articulation: the tongue and jaw are raised as the back of the tongue is used to articulate this vowel. Hence it is a back, close (high) voquel. The lios are rounded. 

Most important spellings

• u: full put
• oo: book, look
• ou: could, should
• o: woman