The Homeric Greek word κάρτος
Word κάρτος
k a r t o ς
Transliteration kartos
Meaning strength, vigour, courage
Synonyms ἀγηνορία, ἀλκή, ἀλκί, ἀνδρότης, κράτος, θάρσος, θράσος, σθένος, τόλμα, κῖκυς

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Iliad

Other words that might be of interest
ἀνάγκη ‘force, constraint, necessity’, ἀναγκάζω ‘force, compel’, βία ‘bodily strength, force’, ἐρωή ‘any quick motion, rush, force’, μένος ‘might, force’