There are multiple synonyms for the word "call on", such as "visit", "drop in on", "stop by", "go to see", or "pay a visit". These phrases share a similar meaning to the original word, which includes making a social visit or requesting someone's presence to speak or address a situation. Other synonyms may also include "contact", "reach out to", "phone", or "summon", which imply different levels of urgency or intentionality. By using synonyms, one can avoid repetition of a word, while still conveying the same meaning in a creative and more engaging way.