Far-out and Irreplaceable

Far-out adjective - Different from the ordinary in a way that causes curiosity or suspicion.

Irreplaceable and far-out are semantically related. In some cases you can use "Irreplaceable" instead an adjective phrase "Far-out".

Irreplaceable adjective - Impossible to replace.

Far-out and irreplaceable are semantically related. Sometimes you can use "Far-out" instead an adjective "Irreplaceable".