The word upsurges refers to a sudden increase or rise. Synonyms for this word include surges, spikes, jumps, escalations, intensifications, and elevations. These words all convey a similar meaning and can be used interchangeably in many contexts.
Other synonyms for upsurges include boosts, swells, spurts, flares, bursts, and outbursts. These words may have slightly different connotations depending on the context in which they are used. For instance, a surge may imply a sudden rush or surge of energy, while a spurt may imply a brief period of intense activity.
Overall, there are many synonyms for upsurges that can help to convey the sudden and intense nature of a growth or increase. Choosing the right synonym will depend on the specific context and desired effect.