For and In

For conjunction - For the reason that.

In and for are semantically related in inside topic. In some cases you can use "In" instead a preposition "For", when it comes to topics like on, by, of, to.

In adjective - Being in the latest or current fashion.

For and in are semantically related in inside topic. Sometimes you can use "For" instead a preposition "In", if it concerns topics such as on, by, of, to.