That which is awful arouses an oppressive, that which is august an admiring reverence; we speak of the august presence of a mighty monarch, the awful presence of death.

J. C. Fernald, English Synonyms and Antonyms (1914)

Popularity over time

Word	1850 → 2019	Trend
august		steady

Use in printed books, per decade from 1850 to 2019.

By length

4 letters: gurt
5 letters: great¹, grand¹, royal², awful², noble², regal²
6 letters: superb², solemn², kingly², lordly²
7 letters: sublime², revered², stately²
8 letters: imposing³, majestic³, princely²
9 letters: honorable⁴, dignified³, venerable⁴
10 letters: honourable⁴
11 letters: magnificent⁴, magisterial⁵

The small number after each word is its number of syllables (royal² = 2 syllables).

In other languages

Français: auguste