Synonyms for Boost (same or very similar meaning)
WordNet sense 1 (an increase in cost):
hike, rise, cost increaseWordNet sense 2 (contribute to the progress or growth of):
advance, encourage, further, promoteWordNet sense 3 (increase):
hike upWordNet sense 4 (the act of giving hope or support to someone):
encouragementWordNet sense 5 (increase or raise):
superchargeFrom the ODE community, based on WordNetadd/edit