Which of these product names was intentionally created as a portmanteau (blend word) that later entered everyday language as a generic term for similar products?

Brand storytelling often leverages language in creative ways to forge connections with consumers. In the world of linguistics and marketing, companies sometimes invent entirely new words that eventually become part of our everyday vocabulary. These neologisms (newly coined terms) represent a fascinating intersection of product design, branding, and language evolution. Test your knowledge about these linguistic innovations that have crossed from corporate trademark to common speech!

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Kleenex (from 'clean' + suffix '-ex')
Velcro (from French 'velours' [velvet] + 'crochet' [hook])
Aspirin (from 'acetylated' + 'spiraea')
Post-it (from 'post' + 'it')