This is the 1308th most frequent Russian word.
словами
"Словами" means "with words" or "in words."
In this sentence, 'словами' is in the instrumental case and is used to indicate the manner of writing.
Пиши своими словами.
Write in your own words.
Here, 'словами' is in the instrumental case, showing the means by which gratitude was expressed.
Он выразил благодарность тёплыми словами.
He expressed gratitude with warm words.
In this instance, 'словами' implies the substitution or usage of certain words in the explanation.