Use the "keywords" settings parameter to add additional search keywords for your block.

keywords-settings-for-gutenberg-block.js

// Import __ from i18n internationalization library
const { __ } = wp.i18n;
// Import registerBlockType() from block building libary
const { registerBlockType } = wp.blocks;
// Import the element creator function (React abstraction layer)
const el = wp.element.createElement;

    

/**
 * Register Block.
 * 
 * @param   {String}    name        Block name, namespaced
 * @param   {Object}    settings    Block settings
 * @return  {?WPBlock}              Return the block or 'undefined'
*/
registerBlockType('js4wpgb/static-content', {
    title: __('Custom Block'),
    icon: el('svg', { width: 20, height: 20 },
        el('path', { d: "M7.5,0.5L5,4.5l-1.5-2 C2.9452,3.4753,0.8036,5.7924,0.8036,8.3036C0.8036,12.002,3.8017,15,7.5,15s6.6964-2.998,6.6964-6.6964 c0-2.5112-2.1416-4.8283-2.6964-5.8036l-1.5,2L7.5,0.5z M7.5,7c0,0,2.5,2.5618,2.5,4.5c0,0.8371-0.8259,2-2.5,2S5,12.3371,5,11.5 C5,9.6283,7.5,7,7.5,7z" } )
    ),
    
    // Additional search terms for your block
    keywords: [ __( 'zac' ), __( 'fire' ), __( 'fuego' ) ],
    
    category: 'common',    
    edit( props ) {
        return el('p', {}, 'Hello world!');
    },
    save( props ) {
        return el('p', {}, 'Hello world!');
    }
});