Nadir, being the lowest point in a series of measured levels, is accepted in both noun and verb forms. To speak of tumor markers after treatment for certain cancers, they will "nadir" at some point before they begin to rise, indicating biochemical recurrence, or one may anticipate levels "nadiring" early in the presence of more aggressive disease.
Zenith or apex.
yes it is a verb
In the right context, trap is already a verb. For example, "to trap something or someone" is an action and therefore a verb.
Yes the word trod is a verb.
must - is called a modal auxiliary verb, must always goes before a main verb in this sentence the main verb is tripped. have - is an auxiliary verb in this sentence. Both of these can be called helping verbs
nadar
Nadir was Erik's friend from Persia.
Nadir Hasan is 5' 8".
Nadir D'Priest was born in 1961.
Nadir Lamyaghri was born in 1976.
Nadir Benoufella was born in 1987.
Nadir Nadirov was born in 1932.
Mehmet Nadir died in 1927.
Mehmet Nadir was born in 1856.
Moyshe Nadir was born in 1885.
Moyshe Nadir died in 1943.
Nadir Khashimov was born in 1990.