fa·nat·i·cism 
(fə-nătĭ-sĭz′əm)
(fə-nătĭ-sĭz′əm)n.
Excessive, irrational zeal, especially in politics or religion.
- overcompensation
- overcompensatory
- overconfidence
- overconfident
- overconfidently
- overcorrect
- overcorrection
- overcritical
- overcritically
- overcrop
- overcrowd
- overdevelop
- overdevelopment
- overdiagnose
- overdiagnosis
- overdo
- overdoer
- overdog
- overdominance
- overdominant
- overdone
- overdosage
- overdose
- overdraft
- overdraw