A portmanteau is:

The correct option is: Creation of new words without reference to the existing morphological resources.

To understand this concept, let us break down the linguistic definition step-by-step:
1. Morphological Resources: In linguistics, morphological resources refer to the existing elements of a language, such as prefixes, suffixes, root words, and established stems, which are typically combined or modified to form new words.
2. Creation of New Words: When a new term is coined entirely from scratch without utilizing or referencing these pre-existing morphological building blocks, it represents a unique category of word formation. This is a process where a completely novel lexical item is introduced into a language's vocabulary.
3. Distinction from other options: This definition distinguishes itself from processes like borrowing (copying words from other languages), homophony (words sounding the same but having different meanings), or blending (combining parts of existing words).