It appears that there are four realities (conditioned and unconditioned) according to Abhidhamma.
Q1)What is the pali word for the reality? What it means?
Q2) Why Nirvana is called Unconditioned reality?
Some information relating to above question:
Four Ultimate Realities (Paramattha Dhammaa)
1)Consciousness (Citta) – conditioned reality
2)The mental factors (Cetasika) i.e Feeling or sensation (Vedana) and Perception (Sanna) which are arise as a result of consciousness (samkhara) – conditioned relaity
3)Material form (Ruppa) –This includes body, sex and seat of consciousness. The body-decade is composed of the Four Primary Elements –Extension, cohesion, heat, motion (Pathavi, apo, tejo, vayo) – conditioned reality
4)Nirvana (Nibbaana) – Nirvana is an unconditioned reality. All other three are conditioned realities.
"The Abhidhamma in Practice", by N.K.G. Mendis. Access to Insight, June 7, 2010, http://www.accesstoinsight.org/lib/auth ... el322.html