Words

Arabic
fissat- - pet (BK 2 591)
Arabic
fasfas-, fisfisat- - bed-bug (BK 2 594)
Arabic
fsḫ - to dislocate, to remove from its place, to separate, to disperse; to be weak in intellect and in body (BK 2 592, Lane 2395)
Alternatively, may go back to PWS *pṣḥ ‘to smash, to grind’ or PWS *pšḫ ‘to break off, to separate’.
Arabic
fsḥ - to be spacious, roomy; VII. to be dilated with joy (one's bosom) (Lane 2395)
Arabic
fasīḥ- - spacious, roomy, wide; free from distress of mind (Lane 2395)
Arabic
fsl - to be low, base, ignoble (Lane 2398)
Arabic
fsr - to discover, to reveal, to render clear, to explain (Lane 2397)
Arabic
fsw - to emit a noiseless wind from one's anus (Lane 2399)
Arabic
fšḫ - II. avoir les membres du corps lâches, sans vigeur (to have loose body members, without vigor) (BK 2 592)
Related as a variant root with š vs. s and a meaning shift?
Arabic
fšl - to be cowardly, weak-hearted (Lane 2401)