Is the word contemplating a gerund?
The word 'building' is the present participle, present tense of the verb to build. The present participle of the verb also functions as an adjective and a gerund (a verbal noun). The gerund 'building' is an abstract noun as a word for the process involved in constructing or repairing structures. The gerund 'building' is a concrete noun as a word for a structure.
Gerund is derived from a verb but functions as a noun and is referred to as a verbal noun. It ends with -ing. A verb on the other hand is a word that describes an action. Example : The word "Say" is a verb in : "He wants you to say this." However, it is used as a noun (Gerund" in : "This is a very popular saying."
The word 'convincingly' is the adverb form of the adjective 'convincing'. The word 'convincing' is the present participle of the verb to convince which functions as an adjective and a gerund, a word that functions as a noun in a sentence. The gerund 'convincing' is an abstract noun as a word for the process or an instance of persuading someone of something; a word for a concept.