This is the 434th most frequent Slovak word.
rast
Growth.
Here 'rast' is a noun meaning 'growth' referring to the development of plants.
Rast rastlín závisí od množstva svetla a vody.
The growth of plants depends on the amount of light and water.
In this sentence, 'rast' again acts as a noun signifying 'growth,' but in this case, in the context of economic development.
Naše mesto zažíva rýchly rast ekonomiky.
Our city is experiencing rapid economic growth.
Here, 'rast' is used as a noun referring to the physical and developmental growth of a child.