... you have an excellent example of a noun

[GoldfishLord]

A noun might be in front of or behind another noun. The word ‘apposition’ implies ‘to place a noun next to another noun to explain it’.

So, if you find a noun next to another noun that explains the other noun, you have an excellent example of a noun in opposition to another noun.

Source: https://englishproficiency.com/blog/what-are-nouns/?expand_article=1#google_vignette

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It seems to me that "have" doesn't mean something close to "hold as a possession".
What does it mean roughly?

 

[Tarheel]

You have an excellent example -- the example you mentioned is an excellent one.

 

[Rover_KE]

A noun might be in front of or behind another noun. The word ‘apposition’ implies ‘to place a noun next to another noun to explain it’.

So, if you find a noun next to another noun that explains the other noun, you have an excellent example of a noun in opposition to another noun.

Note the typo in the above quote – 'opposition' should be 'apposition'.

 

[Piscean]

Source: https://englishproficiency.com/blog/what-are-nouns/?expand_article=1#google_vignette

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It seems to me that "have" doesn't mean something close to "hold as a possession".

It seldom does.