beta particle — a high-speed electron or positron emitted by a nucleus during radioactive decay or nuclear fission
convertible — A convertible is a car with a soft roof that can be folded down or removed.
discernible — capable of being discerned; distinguishable.
non-enforceable — to put or keep in force; compel obedience to: to enforce a rule; Traffic laws will be strictly enforced.
impersonal — not personal; without reference or connection to a particular person: an impersonal remark.
observable — Able to be noticed or perceived; discernible.
proportional — having due proportion; corresponding.
rechargeable — (of a storage battery) capable of being charged repeatedly. Compare cordless (def 2).
remarkable — notably or conspicuously unusual; extraordinary: a remarkable change.
reportable — an account or statement describing in detail an event, situation, or the like, usually as the result of observation, inquiry, etc.: a report on the peace conference; a medical report on the patient.
returnable — that may be returned: returnable merchandise.
reversible — capable of reversing or of being reversed.
supportable — capable of being supported; endurable; maintainable.
transport — to carry, move, or convey from one place to another.
unworkable — practicable or feasible: He needs a workable schedule.
Four-or-more syllable rhymes
definite article — The word 'the' is sometimes called the definite article.
hierarchical — of, belonging to, or characteristic of a hierarchy.
insupportable — not endurable; unbearable; insufferable: insupportable pain.
interpersonal — of or pertaining to the relations between persons: He has strong interpersonal skills.
irreversible — not reversible; incapable of being changed: His refusal is irreversible.
unenforceable — to put or keep in force; compel obedience to: to enforce a rule; Traffic laws will be strictly enforced.
unremarkable — notably or conspicuously unusual; extraordinary: a remarkable change.
unsupportable — capable of being supported; endurable; maintainable.
portugal — a republic in SW Europe, on the Iberian Peninsula, W of Spain. (Including the Azores and the Madeira Islands) 35,414 sq. mi. (91,720 sq. km). Capital: Lisbon.
psi particle — any of a family of mesons consisting of a charmed quark and a charmed antiquark.