πρόθυμον [2 verses](adj sg neut nom/acc) "Is willing" is prothymos, which means "ready", "willing", "eager", "bearing goodwill", "wishing well," and "readily."  -  - The term translated as "willing means "ready", "willing", "eager", "bearing goodwill", "wishing well," and "readily." This is an uncommon word from Christ to use.

λοιπὸν [2 verses](adj sg neut acc) "Now" is from loipon, which means "remaining over", "descendants", "what remains", and of time "the future", "henceforth", and "hereafter."  - (WW) The word translated as "now" means "the remains" normally and "the future" when referring to time. . However, it is also a very rare word for Christ. Jesus often uses rare words for humorous effect.

πρωτοκαθεδρίας [3 verses] (noun pl fem acc) "Chief seats" comes protokathedria which literally means "first seats." The prefix in this word means "first" and "highest" from protos. In place, this means "the foremost." In order, it means "the first." Of rank or degree, it means "the highest" or "the best." It's root is kathedra, which means a "seat" to sit on, the "posterior," the "sitting posture," "sitting idle," "inaction," the "chair of a teacher," and "a throne."

πρωτοκλισίαν [5 verses] (noun sg fem acc) "Uppermost rooms" is protoklisia, which means "first seat at table," literally "foremost couches." The prefix in this word means "first" and "highest" from protos. In place, this means "the foremost." In order, it means "the first." Of rank or degree, it means "the highest" or "the best." It's root is klisia, which means "a place for lying down or reclining," "anything for lying or sitting upon," a "couch for reclining at a table," "nuptial bed," and a "company" of people reclining at meals. - - The word translated as "uppermost rooms" means "first seat at table," literally "foremost couches."

πρῶτον [41 verses](adj sg neut nom/acc or adj sg masc acc) "First" is protos. In place, this means "before," "in front," and, as a noun, "the foremost." Of time, it means "former," "earlier," and, as a noun, "the initial." In order, it means "the first." In math, it means the prime numbers. Of rank or degree, it means "superior" or, as a noun, "the highest" or "the best." -- The word translated as "first" takes a lot of different types of "first" meanings from its context. Here, it is technically an adjective but it plays the role of the English adverb "initially."