gros / grow are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
gros: NA
grow: (verb) become larger, greater, or bigger; expand or gain. (verb) increase in size by natural process. (verb) cause to grow or develop. (verb) cultivate by growing, often involving improvements by means of agricultural techniques. (verb) come to have or undergo a change of (physical features and attributes). (verb) become attached by or as if by the process of growth.
gros: g·r·OW·s
grow: g·r·OW
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)