The Northwestern Iranian languages are a branch of the Western Iranian language group, spoken by about 40-50 million people in southwest Asia; They are classified into about 9 groups; each group in this list contains subgroups, dialects or individual languages, eventually forming 53-54 branches.
A notable old Iranian language in this group is Median; a notable Middle Iranian language in this group is Parthian
Laki language Laki is a transitory language between the South-Western Iranian languages, notably Luri language and the North-Western Iranian languages e.g Kurdish languages.
References
Compendium Linguarum Iranicarum, ed. Schmitt (1989), p. 99.