* Compound word: This is the most common term, and it applies to words formed by combining two or more words, usually with a hyphen or space between them. Examples: "high-tech", "snow-white", "blackboard".
* Portmanteau: This term refers to a word created by merging parts of two or more words. It often involves blending sounds or syllables. Examples: "smog" (smoke + fog), "brunch" (breakfast + lunch), "shopaholic" (shop + alcoholic).
* Blends: This term is similar to portmanteau and can be used interchangeably.
* Concatenation: This term is more technical and refers to the act of joining two or more things together. It's not as commonly used for words, but it can be applied in specific contexts.
* Fusion: This term emphasizes the complete merging of two words into one, with no distinction between the original parts.
The best term to use will depend on the specific example and the context in which you are discussing it.