Please explain conversion as a Morphological device.
Morphology refers to the internal structure and formation of words. It is the study of the meaning of words and how to relate sounds to the meaning of words. A morpheme is the most basic unit of structure in linguistics - a basic element of meaning or a basic form.
Conversion is a process in morphology by which speakers of a language change or modify the meaning of words or the base form of words (morphemes). There are two basic kinds of morphological processes: concatenative (combining morphemes) and non-concatenative (modifying the internal structures of the morphemes). Conversion is considered to be in the latter group.
There is a great explanation of this at the link below, which a professor of linguistics has posted online to share. This link gives examples which you should find helpful.