Increases numbers of shapes (5)
I believe the answer is:
cubes
This could be a double definition.
'increases numbers' is the first definition.
'cubes' can be an answer for 'numbers' (cube is a kind of number). I'm not sure about the 'increases' bit.
'shapes' is the second definition.
(cube is a kind of shape)
'of' acts as a link.
Can you help me to learn more?
(Other definitions for cubes that I've seen before include "Solid body with six equal square faces" , "blocks" , "1, 8, 27, 64, ..." , "die? More than one" , "Eg, eight, twenty-seven" .)