That is clearly the case here.

a large trunk or suitcase, typically made of stiff leather and opening into two equal parts.

>consisting of or combining two or more separable aspects or qualities.

I recommend the Wikipedia article [0] as well. Here is a snippet:

>A portmanteau (Listeni/pɔːrtˈmæntoʊ/, /ˌpɔːrtmænˈtoʊ/; plural portmanteaus or portmanteaux /-ˈtoʊz/) or portmanteau word is a linguistic blend of words,[1] in which parts of multiple words, or their phones (sounds), and their meanings are combined into a new word.[1][2][3] The word "portmanteau" comes from the French for overcoat stand (porte manteau), where many coats may be placed on top of coats that are already on the stand, which continues to function as a coat stand.

>A portmanteau word fuses both the sounds and the meanings of its components, as in smog, coined by blending smoke and fog,[2][4] or motel, from motor and hotel.[5] In linguistics, a portmanteau is defined as a single morph that represents two or more morphemes.[6][7][8][9]

[0] https://en.wikipedia.org/wiki/Portmanteau

HyperTerm appears to be a Hypertext Markup Language Terminal.