(Just) semantics!

[Theseus]

Arguing that something is "just semantics" is a common colloquialism.
"Semantics" has to do with considering the meanings of words. When someone says "that's just semantics," it's used idiomatically—a phrase repeated whole, parroted. It's a put-down. It means "You're about to talk about words, but words don't matter." Or it means "suggesting that two words don't mean the same thing will be branded cheating in this discussion if this bullying gesture causes you to back down." But often the people using the phrase aren't clearly aware of their intent. Probably it's because they're not too interested in the meanings of words.
(For clarity of thought and for value of discussions about unschooling (or anything), it's important to use words intentionally and carefully. If a parent can't tell the difference between "consequences" and "punishment" and doesn't want to even try to, she'll probably keep punishing her children and telling herself it's not punishment, it's consequences. That muddled thinking can't lead to clarity nor to better parenting.)

Is there a Greek equivalent, corresponding to this phrase?:down:

 

[Themis†]

No time for explanations, but here are some ideas:
(αυτά είναι) ψιλά γράμματα (=unimportant; colloquial)
περί όνου σκιάς (argument about an insignificant matter, without any real substance; quite sophisticated)
(αυτά είναι) δικολαβίστικα (when someone tries to press an argument through a twisted usage of words and formulations; quite aggressive)
παίζουμε με τις λέξεις (there is only a difference of words or formulation, in fact we are saying the same thing; colloquial)
παίζεις με τις λέξεις (as above, but when addressed to your interlocutor it is a bit aggressive; colloquial)