attribute, a tribute

Attribute or attribute ( one word )  means to regard as belonging to or produced by--
We hope an expert will attribute this painting to a famous artist. 
If you don't sign your work, we may accidentally attribute it to someone else.

Attribute or attribute may also mean the quality or aspect regarded as belonging to someone--
His most outstanding attribute is his ability to keep up employee morale.
Keeping quiet while someone is talking is the main attribute of a good listener.

A tribute or a tribute ( two words ) means one ( a ) compliment or testimonial ( tribute )--
They had a special plaque made, as a tribute to his years with the company.
His popularity is a tribute to his kindness and generosity.

A tribute may also mean a payment levied or exacted by a king or state as a promise of peace or protection--
The general demanded a tribute paid in gold, as the price of leaving the city in peace.
The king offered the raiders a tribute of a dozen horses, to be paid if they agreed to leave.

Now that you know that, you can say--
"The board plans to attribute the firm's success to the CEO, as a tribute to his dedicated service."