Common Words:
* Actual
* Brutal
* Central
* Chemical
* Critical
* Digital
* Essential
* Final
* General
* Global
* Initial
* Legal
* Medical
* Mental
* Natural
* Personal
* Physical
* Political
* Practical
* Professional
* Social
* Spiritual
* Typical
Less Common Words:
* Aboriginal
* Anarchial
* Astral
* Austral
* Biblical
* Canonical
* Classical
* Doctoral
* Editorial
* Ephemeral
* Experimental
* Imperial
* Interval
* Lateral
* Literal
* Marital
* Memorial
* Ministerial
* Musical
* National
* Oriental
* Presidential
* Provincial
* Ritual
* Substantial
* Tropical
* Universal
* Verbal
* Visual
Words from other languages:
* Amal (Arabic)
* Bandal (Hindi)
* Carnaval (Spanish)
* Chandal (Hindi)
* Corral (Spanish)
* Festival (Spanish)
* Himal (Hindi)
* Kandal (Hindi)
* Nepal (Nepali)
* Portal (Spanish)
* Revival (Spanish)
* Sandal (Hindi)
* Tribal (Spanish)
* Valhal (Norse)
This is not an exhaustive list, but it gives you a good starting point. The suffix "al" can be used to create many different words, and it's often used to indicate a quality, state, or relationship.