Finding alternative words for 'spare-time activity' can help to add variety to our speech and writing. Some possible synonyms for this term might include 'hobby,' 'pastime,' 'leisure pursuit,' 'interest,' 'recreation,' 'avocation,' 'diversion,' 'pursuit,' or 'leisure activity.' Each of these terms offers a slightly different nuance, and may be more or less appropriate in different contexts. For example, 'avocation' might suggest a more serious or dedicated pursuit, while 'diversion' might imply a more casual or occasional interest. By using a range of alternative words and phrases for 'spare-time activity,' we can add interest and depth to our language, and better communicate our thoughts and ideas.