The name for a type of map between vector spaces

Question

Is there a name for a map $f:V \to W$ between two $\mathbb{K}$-vector spaces that is not linear map but which still staisfies $$ f(\lambda v) = \lambda f(v), ~~~~~ \textrm{ for all } \lambda \in \mathbb{K}, ~ v \in V? $$ I guess the additive structure of $V$ and $W$ is not so important so the question could just be asked about two sets equipped with an action of a field, which is to say two $G$-sets, where $G$ is the group of non-zero elements in $\mathbb{K}$.