偏 is specifically the left-hand component of a kanji, while 部首 is the general term for the classifying component used to look up a character in a dictionary, which may or may not be a 偏.
Used to count the number of strokes (画) in a kanji component (偏).
prejudice; bias; distorted view
deviation; deflection; variation
bias; tendency; inclination; deflection
migraine
overemphasis; disproportionate weight; lopsided focus
favoritism; partiality
unbalanced diet; picky eating
narrow-minded; stubborn; perverse; eccentric
uneven distribution; maldistribution
Standard kanji spelling for the left-hand radical of a kanji.
The kanji 偏 originally means 'side' or 'inclined', and its use for the left-hand radical comes from the idea of a component placed on the side of a character.
bias; obsession; stubborn fixation
narrow-minded; intolerant; illiberal
westerlies; prevailing westerlies
monomania; monomaniac
kanji 'direction' radical at left (radical 70)
wholly; entirely; nothing but · single-minded; wholehearted; intent · one-sided; unbalanced; prejudiced
impartiality; neutrality; fairness
person radical (radical 9)
deviation; bias
polarized light; polarization (of light)
obstinate; stubborn; narrow-minded
rural areas; remote countryside
eccentricity
partiality; liking; preference
eccentricity