会计 (kuàijì) alone means 'accounting' or 'accountant' (the role). 会计师 adds the professional suffix 师, indicating a certified/qualified accountant. Note: 会 is read kuài (not huì) in this word.
mistakes
The 会 in 会计 is pronounced kuài (fourth tone), NOT huì. This is one of the most commonly mispronounced words by Chinese learners.
