~力 (ability suffix)

The Sino-Japanese suffix ~力 (りょく) attached to a domain-noun to form an ability or capacity noun — 英語力 ('English ability'), 集中力 ('concentration'), 想像力 ('imagination'), 観察力 ('powers of observation'), 記憶力 ('memory'), 体力 ('physical stamina'). Highly productive across cognitive, physical, and skill domains.