"Náš učitel fyziky je Slovák."

[Hugo647250]

Is a Slovak? Or is the word in the Czech original an adjective?

[VladaFu]

A Slovak is accepted, but it is more common in English to use it as an adjective.

[Hugo647250]

So there's really no way to tell whether the word is adjective or noun.

[VladaFu]

In Czech it is absolutely clear. Slovák is a noun.

[Hugo647250]

Dekuji. I should have remembered, the adjective form is "slovensky" right?

[VladaFu]

yes

[JanLna]

"slovensky" is adverb, "slovenský" is adjective

[SerhiyBila]

What't wrong with "Our teacher of physics is Slovak"?

[VladaFu]

It seems unusual https://books.google.com/ngrams/graph?content=our+physics+teacher%2C+our+teacher+of+physics&year_start=1800&year_end=2000&corpus=15&smoothing=3&share=&direct_url=t1%3B%2Cour%20physics%20teacher%3B%2Cc0 but if English natives will find it correct English it may be added in the future.