Rudimentary vs Immature - What's the difference?

Rudimentary is a related term of immature.

is that rudimentary is of or relating to one or more rudiments while immature is not fully formed or developed, unripe, not mature.

(en adjective)

of or relating to one or more rudiments

I have only a rudimentary grasp of chemistry .

Basic; minimal; with less than, or only the minimum, necessary.

His grasp of rudimentary English allowed him at least to do the shopping .

His rudimentary driving skills meant that he was a danger on the road .

(en adjective)

Not fully formed or developed, unripe, not mature.

Silly or childish in behavior, not mature.

You're only young once, but you can be immature the rest of your life.

* .

The mark of the immature man is that he wants to die nobly for a cause, while the mark of a mature man is that he wants to live humbly for one.