1. Verbs for Describing Trends:
    • Increase
    • Decrease
    • Rise
    • Fall
    • Climb
    • Drop
    • Fluctuate
    • Plateau
    • Soar
    • Plummet
  2. Adjectives for Describing Trends:
    • Steady
    • Gradual
    • Sharp
    • Substantial
    • Slight
    • Dramatic
    • Consistent
    • Rapid
    • Marginal
    • Significant
  3. Nouns for Describing Trends:
    • Growth
    • Decline
    • Spike
    • Downturn
    • Upsurge
    • Peak
    • Trough
    • Fluctuation
    • Momentum
    • Stagnation
  4. Comparative Language:
    • Compared to
    • In contrast to
    • Similarly
    • Likewise
    • By comparison
    • In a similar vein
    • Conversely
    • On the contrary
    • Contrarily
    • Correspondingly
  5. Expressions for Emphasizing:
    • Notably
    • Significantly
    • Markedly
    • Noticeably
    • Considerably
    • Substantially
    • Clearly
    • Remarkably
    • Evidently
    • Undoubtedly
  6. Phrases for Summarizing Data:
    • Overall, it can be seen that…
    • In summary, …
    • To sum up, …
    • As the data indicates, …
    • Looking at the overall picture, …
    • In general, …
    • To conclude, …
    • Taken as a whole, …
  7. Describing Peaks and Valleys:
    • Reaching a peak
    • Attaining a trough
    • Reaching a high point
    • Hitting a low point
    • Climbing to a zenith
    • Falling to a nadir
  8. Patterns and Relationships:
    • Correlate
    • Correlation
    • Direct relationship
    • Inversely proportional
    • Linear relationship
    • Nonlinear relationship
    • Positive correlation
    • Negative correlation
    • Exponential growth
    • Logarithmic decline
  9. Quantifying Data:
    • Percentage
    • Proportion
    • Fraction
    • Ratio
    • Per capita
    • Per annum
    • Per unit
    • Per capita
    • Relative to
    • Absolute numbers
  10. Language for Trends Over Time:
    • Over the years
    • Over the decades
    • Across the centuries
    • Throughout the period
    • From (year) to (year)
    • Year-on-year
    • Decade-by-decade
    • Across the timeline

Using a variety of these words and phrases can enhance the precision and richness of your description when writing about graphs in the IELTS exam.