ほうし
奉仕(ほうし)、奉納(ほうのう)、奉る(たてまつる)
service, offering, to offer (humble)
On-reading (ホウ) is used in compounds; kun-reading (たてまつ(る)) is used standalone or with okurigana. Appears in many compounds — memorize the key ones rather than the kanji in isolation. This kanji forms verbs/adjectives with okurigana. Practice both the word form and compound forms.