> How could language express an unlimited array of thoughts when language cannot even fully express the experience of eating a chicken nugget? Can language express all your thoughts when looking at a sunrise? When embracing your lover after a hard day?

I think your attempts at counterexamples are bad.

None of those experiences (modulo being vegetarian so no chicken) seem to me to be hard to express in language. Slow, perhaps, but not hard.

However.

I believe that words are mere references to experiences, and without shared experience the meaning of any given word will generally differ somewhat between any two minds, and therefore while my words can model my experiences I can be sure that those same words will not create in your mind more than a merely similar experience, not even if you can visualise all the same senses, which you may not: if you have aphantasia, me saying "red" will never convey red in quite the same way, and I assume all other senses have equivalents though I do not know their names.