Root ف ت ر(f t r) has 3 unique word forms and appears 3 times in the Quran.

English gloss Slackness, Weakness, Short Span of time, Warm water, Laxity

Word Translation Occurrences
فَتۡرَةٖ (after) an interval (of cessation) 2
يُفَتَّرُ will it subside 2
يَفۡتُرُونَ they slacken 2