The Nuance Difference: "いつも" vs "予約する"

In Japanese, both いつも and 予約する are often translated to English but have distinct usages. いつも (いつも (itsumo)) represents "always, usually, habitually" (Level: N5) and typically represents Adverb of frequency. Indicates something happens all the time or habitually without exception.. On the other hand, 予約する (よやくする (yoyaku suru)) translates to "to reserve; to book" (Level: N4) and is used for Used for making reservations for hotels, restaurants, tickets, appointments, etc. It's a noun + する verb.. Mixing these up can sound unnatural to native Japanese speakers!