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ball

In a sentence
Zem je lopta.
The earth is a ball.
Zem je guľatá ako lopta.
The Earth is round like a ball.
Zem je okrúhla ako lopta.
The Earth is round like a ball.
Lopta je guľatá.
The ball is round.
Examples from Tatoeba (CC BY 2.0 FR).
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Example sentences from Tatoeba (CC BY 2.0 FR).
Full attribution on References.